Three-Dimensional Force and Deflection Analysis of a Variable Cross Section Drill String

[+] Author and Article Information
B. H. Walker

Christensen, Inc., Diamond Technology Center, Salt Lake City, Utah

M. B. Friedman

Division of Mathematical Methods in Engineering and Operations Research, School of Engineering and Applied Science, Columbia University, New York, N. Y.

J. Pressure Vessel Technol 99(2), 367-373 (May 01, 1977) (7 pages) doi:10.1115/1.3454543 History: Received June 28, 1976; Online October 25, 2010


A mathematical model of an oil field drill string which includes the effect of torque has been developed. The drill string can include arbitrary members with known mechanical properties. The solution gives the three-dimensional deflection curve, forces on the borehole wall, the magnitude and direction of the resultant force and slope of the deflection curve at the bit.

Copyright © 1977 by ASME
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